Investigators have said the blaze was caused by an overloaded electrical junction box in the home's attic.

Quincy Fire Chief Joe Henning says rescuers managed to pull the child's mother from a basement window. But the man and 4-month-old boy became trapped on the home's main floor, where the fire was most intense.

The woman was also taken to a hospital, but there was no immediate information on her condition.

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